Experimental study on the dynamic response of a marine riser in touchdown zone under lateral earthquake
DAI Yunyun1,2,LI Zhigang1,FENG Xin2,LIU Shuai2,3,GUO Lingyun2,ZHOU Jing2
1.College of Civil Science and Engineering, Yangzhou University, Yangzhou 225127, China;
2.State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China;
3.City Institute, Dalian University of Technology, Dalian 116024, China
Abstract:A set of experimental system for riser and seabed interaction was developed by using PVC pipeline and soft clay. Modal test and seismic test of the pipe-soil system on a large-sized shaking table were performed in this paper. The first three order frequencies and correspondent vibration mode shapes transversely were obtained from the modal test. Seismic response of some feature points along pipeline and pipe ring in touchdown zone and the adjacent surface zone and catenary zone was also observed. Results show the strain response of riser in surface zone was very small under lateral seismic excitation. The maximum strain response appeared in the touchdown zone of riser. Strain response of the riser in catenary zone was also severe, being another key part of the riser. In addition, dynamic response in lateral side of the pipeline is more severe than the top and bottom of the riser under lateral seismic excitation. Test results enrich the research on dynamic model test of the marine riser around touchdown zone, providing scientific basis for seismic design and safety assessment of riser in service.
代云云1,2,李志刚1,冯新2,刘帅2,3,郭凌云2,周晶2. 海洋立管触地段横向地震动响应的试验研究[J]. 振动与冲击, 2020, 39(18): 132-137.
DAI Yunyun1,2,LI Zhigang1,FENG Xin2,LIU Shuai2,3,GUO Lingyun2,ZHOU Jing2. Experimental study on the dynamic response of a marine riser in touchdown zone under lateral earthquake. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(18): 132-137.
[1] Godoy-Marroquin OA, de Sousa FJM, Sagrilo LVS. Response- based environmental conditions for the design of steel catenary riser [J]. Applied Ocean Research, 2018 (70): 41-53.
[2] Dai Y., Zhou J. Dynamic response of pipeline in touchdown zone under complicated loadings [C]. Proceedings of the 12th Pacific-Asia Offshore Mechanics Symposium. 2016.
[3] Dong X., Shiri H. Performance of non-linear seabed interaction models for steel catenary risers, part I: Nodal response [J]. Ocean Engineering. 2018 (154):153-166.
[4] Dong X., Shiri H. Performance of non-linear seabed interaction models for steel catenary risers, part I: global response [J]. Applied Ocean Research. 2019 (82):158-74.
[5] 代云云, 周晶. 改进的Winkler弹性地基模型在立管触地段动力分析中的应用[J]. 哈尔滨工程大学学报.2018 (39):1451-1457.
Dai Yun-yun, ZHOU Jing. Application of an improved Winkler elastic foundation-based model to the dynamic analysis of damaged pipelines in the touchdown zone [J] Journal of Harbin Engineering University. 2018 (39):1451-1457.
[6] 代云云, 冯新, 周晶,等. 复杂荷载作用下立管触地段损伤管道极限内压承载力的数值分析[J].水电能源科学.2017 (35): 100-103.
DAI Yun-yun, FENG Xin, ZHOU Jing, et al. Numerical Examination of Ultimate Internal Pressure of Damaged Pipeline in Touchdown Zone under Complicated Loadings [J]. Water Resource and Power. 2017 (35): 100-103.
[7] Wu Z. W., Liu J. K., Liu Z. Q., et al. Parametrically excited vibrations of marine riser under random wave forces and earthquake [J]. Advances in Structural Engineering. 2016, 19 (3): 449-462.
[8] Dai Y., Zhou J. Experimental investigations on seismic response of pipeline in touchdown zone [J]. International Journal of Naval Architecture and Ocean Engineering. 2018 (10): 348-359.
[9] Bridge C., Howells H., Toy N., et al. Full-scale model tests of a steel catenary riser [C] 2nd International Conference on Fluid Structure Interaction. 2003: 107-116.
[10] Hodder M. S., Byrne B. W. 3D experiments investigating the interaction of a model SCR with the seabed [J]. Applied Ocean Research. 2010, 32 (2): 146-157.
[11] Wang L., Li K., Yuan F. Lateral cyclic interaction between catenary riser and soft seabed [J]. Applied Ocean Research. 2017, 63: 11-23.
[12] Bai X., Chen K., Xie Y., et al. Experiment on steel catenary riser -soil interaction in touchdown zone [J]. Shipbuilding of China. 2016, 57: 112-119.
[13] Yao R., Bai X., Xie Y. Small-scale 3D experiment research on interaction between SCR and seabed [J]. The Ocean Engineering. 2015, 33: 93-99.
[14] 郑志昌, 陈俊仁, 朱照宇. 南海海底土体物理力学特征及其地质环境初步研究[J]. 水文地质工程地质. 2004, (04): 50-53.
ZHENG Zhichang, CHEN Junren, ZHU Zhaoyu. Physical and mechanical characteristics of seabed soils and its geological environment in South China Sea [J]. Hydrogeology and Engineering Geology. 2004, (04): 50-53.